在哪里放置AutoMapper.CreateMaps？ [英] Where to place AutoMapper.CreateMaps?

问题描述

我在 ASP.NET MVC 应用程序中使用 AutoMapper 。我被告知，我应该将$ code> AutoMapper.CreateMap 移动到别处，因为它们有很多开销。我不太确定如何设计我的应用程序将这些呼叫放在一个地方。

I'm using AutoMapper in an ASP.NET MVC application. I was told that I should move the AutoMapper.CreateMap elsewhere as they have a lot of overhead. I'm not too sure how to design my application to put these calls in just 1 place.

我有一个Web层，服务层和数据层。每个项目都是自己的。我使用 Ninject 来DI一切。我将在Web和服务层中使用 AutoMapper 。

I have a web layer, service layer and a data layer. Each a project of its own. I use Ninject to DI everything. I'll utilize AutoMapper in both web and service layers.

那么你为 AutoMapper 的CreateMap设置什么？你放在哪里你如何称呼？

So what are your setup for AutoMapper's CreateMap? Where do you put it? How do you call it?

推荐答案

无关紧要，只要它是一个静态类。

Doesn't matter, as long as it's a static class. It's all about convention.

我们的约定是每个图层（网页，服务，数据）都有一个名为 AutoMapperXConfiguration.cs 的单个文件，使用一种名为 Configure（）的方法，其中 X 是图层。

Our convention is that each "layer" (web, services, data) has a single file called AutoMapperXConfiguration.cs, with a single method called Configure(), where X is the layer.

Configure（）方法然后调用 private 每个区域的方法。

The Configure() method then calls private methods for each area.

以下是我们的Web层配置示例：

Here's an example of our web tier config:

public static class AutoMapperWebConfiguration
{
   public static void Configure()
   {
      ConfigureUserMapping();
      ConfigurePostMapping();
   }

   private static void ConfigureUserMapping()
   {
      Mapper.CreateMap<User,UserViewModel>();
   } 

   // ... etc
}

我们为每个聚合（用户，帖子）创建一个方法，所以事情分开很好。

We create a method for each "aggregate" (User, Post), so things are separated nicely.

然后你的 Global.asax ：

AutoMapperWebConfiguration.Configure();
AutoMapperServicesConfiguration.Configure();
AutoMapperDomainConfiguration.Configure();
// etc

这就像一个单词界面 - 不能执行它，但你期望它，所以你可以编码（并重构）如果需要。

It's kind of like an "interface of words" - can't enforce it, but you expect it, so you can code (and refactor) if necessary.

编辑：

只是想我会提到我现在使用AutoMapper 个人资料，所以上述例如：

Just thought I'd mention that I now use AutoMapper profiles, so the above example becomes:

public static class AutoMapperWebConfiguration
{
   public static void Configure()
   {
      Mapper.Initialize(cfg =>
      {
        cfg.AddProfile(new UserProfile());
        cfg.AddProfile(new PostProfile());
      });
   }
}

public class UserProfile : Profile
{
    protected override void Configure()
    {
         Mapper.CreateMap<User,UserViewModel>();
    }
}

更干净/更健壮。

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